Cracked panels and worn fireplace parts fixed in McDonald

A factory-built fireplace is a tested system

A prefab or zero-clearance fireplace is a steel firebox assembly built in a factory and tested together with its own chimney under UL 127, the standard for factory-built fireplaces. Under section R1004.1 of the Florida Building Code, Residential, these units must carry a listing and a label, and they go in only as that listing allows.

Repair follows the same logic. A part that keeps the unit inside its listing is the maker's part for that model, installed the way the manual shows. Our pros start every prefab fireplace repair from that point.

Finding the rating plate on your fireplace

Every listed factory-built fireplace carries a rating plate with the maker, the model and the serial number. One maker's manual places it on the smoke shelf, just inside the top of the opening, and the manual for your model shows where yours sits.

We find and read that plate before discussing any part. With the fireplace cold, you can often spot it yourself with a flashlight, and writing down the model and serial number before you call speeds up the parts search.

• Maker's name
• Model name or number
• Serial number
• Listing information

Alterations that take a fireplace out of its listing

Makers draw a clear line around changes to their units. One maker lists actions that void its warranty and that it disclaims responsibility for, including modification of the fireplace, its components, doors, air inlet system and damper control, and use of component parts it did not make or approve.

Past owners and past remodels sometimes altered a unit by trimming a panel, removing a shield or blocking an air inlet. We look for those changes, explain what each one affects and list what it takes to return the fireplace to its intended build.

When a cracked panel needs replacing

Makers set their own limits for when a cracked refractory panel should be replaced, and those limits live in the owner's manual for each model. A panel that has lost pieces, crumbles at the edges or leaves steel showing behind it is past any reasonable limit.

We read your model's guidance, look at every panel and tell you which ones need replacement now and which can be watched. The estimate names each panel by its position and its part number.

• Pieces missing from the panel
• Crumbling edges
• Steel visible behind the panel
• Cracks wider than the manual allows